package com.heima.kafka.simple;

import org.apache.kafka.clients.consumer.*;

import java.time.Duration;
import java.util.Collections;
import java.util.Properties;

/**
 * @author Psycho
 * @create 2022-04-29-11:08
 */
public class ConsumerQuickStart {
    public static void main(String[] args) {
        //1.kafka的配置信息
        Properties properties = new Properties();
        //kafka的连接地址
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,"192.168.200.130:9092");
        //消息key的序列化器
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG,"org.apache.kafka.common.serialization.StringDeserializer");
        //消息value的序列化器
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,"org.apache.kafka.common.serialization.StringDeserializer");
        //
        properties.put(ConsumerConfig.GROUP_ID_CONFIG,"group1");


        KafkaConsumer<String,String> consumer = new KafkaConsumer<String,String>(properties);

        //3.订阅主题
        consumer.subscribe(Collections.singletonList("kafka-topic"));

        //当前线程一直处于监听状态
        while (true) {
            //4.获取消息
            ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
            for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                System.out.println(consumerRecord.key());
                System.out.println(consumerRecord.value());
            }
        }

    }
}
